Hi all,
I have a field which details unique ID's in one table from a universe and I wish to join it with another field from another table in a different universe. However, I keep getting this error below.

Using the query filter, the option for [IAS_PersonId] is greyed out completely hence trying this method.
I am very much new to this but require this feature to be implemented to allow easier workflow in future.
Any assistance for resolving this would be greatly appreciated.